____ nearly all behavior is learned behavior is a basic assumption of social scientists.
| A．/ | B．That | C．It is acceptable | D．When |
---How could you _______ my sister so easily in the crowd ?
---Because she stood out in a red dress.
| A．pick out | B．pick up | C．take up | D．take out |
Not until the motorbike looked almost new ______repairing and cleaning it.
| A．he stopped | B．did he stop | C．stopped he | D．he did stop |
_________ the task , they have to stay there for another two weeks.
| A．Not completing | B．Not completed |
| C．Not having completed | D．Having not completed |
Visitors were struck by the natural _________ here, which was beautiful beyond description.
| A．resource | B．scenery | C．disaster | D．element |
If you don’t explain clearly, you will just _______ the reader.
| A．confuse | B．satisfy | C．intend | D．remind |